# All files / services/whatsapp index.js

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     /**
     * WhatsApp Service - Main Orchestrator
     * Coordinates all WhatsApp modules with tenant isolation
     *
     * @module services/whatsapp
     */

    const path = require('path');
    const { logger } = require('../../config/logger');
    const WhatsAppConnection = require('./WhatsAppConnection');
    const WhatsAppMessageHandler = require('./WhatsAppMessageHandler');
    const WhatsAppMediaHandler = require('./WhatsAppMediaHandler');
    const WhatsAppQRHandler = require('./WhatsAppQRHandler');
    const WhatsAppStateManager = require('./WhatsAppStateManager');

    class WhatsAppService {
      constructor(io, options = {}) {
        this.io = io;
        this.enableOpenAI = options.enableOpenAI || false;

        // Initialize modules
        this.stateManager = new WhatsAppStateManager(
          options.sessionPath || path.join(__dirname, '../../sessions')
        );

        this.qrHandler = new WhatsAppQRHandler(io, {
          maxQrGenerations: options.maxQrGenerations || 10,
          qrTimeoutDuration: options.qrTimeoutDuration || 120000
        });

        this.mediaHandler = new WhatsAppMediaHandler({
          uploadPath: options.uploadPath || path.join(__dirname, '../../uploads/whatsapp'),
          maxFileSize: options.maxFileSize || 50 * 1024 * 1024
        });

        this.connection = new WhatsAppConnection(io, this.stateManager, this.qrHandler, {
          maxReconnectAttempts: options.maxReconnectAttempts || 10
        });

        this.messageHandler = new WhatsAppMessageHandler(io, this.mediaHandler, {
          enableOpenAI: this.enableOpenAI
        });

        logger.info('WhatsApp Service initialized');
      }

      /**
       * Restore all saved sessions on server startup
       * @returns {Promise<void>}
       */
      async restoreAllSessions() {
        try {
          logger.info('🔄 Restoring saved WhatsApp sessions...');

          const { pool } = require('../../config/database');

          // Get all active tenants (exclude system tenant id=0)
          const [tenants] = await pool.query(
            `SELECT id, name FROM tenants WHERE status = 'active' AND id != 0`
          );

          logger.info(`Found ${tenants.length} active tenants`);

          let restored = 0;
          let skipped = 0;

          for (const tenant of tenants) {
            try {
              // Check if tenant has saved session
              if (this.stateManager.hasSession(tenant.id)) {
                logger.info(`📁 Restoring session for tenant: ${tenant.name} (ID: ${tenant.id})`);

                // Initialize connection (will load saved session)
                await this.initializeTenant(tenant.id);
                restored++;

                // Small delay to avoid overwhelming the system
                await new Promise(resolve => setTimeout(resolve, 1000));
              } else {
                logger.debug(`⏭️  No saved session for tenant: ${tenant.name} (ID: ${tenant.id})`);
                skipped++;
              }
            } catch (error) {
              logger.error(`❌ Failed to restore session for tenant ${tenant.id}:`, error.message);
            }
          }

          logger.info(`✅ Session restoration complete: ${restored} restored, ${skipped} skipped`);
        } catch (error) {
          logger.error('Error restoring sessions:', error);
        }
      }

      /**
       * Initialize WhatsApp connection for tenant
       * @param {number} tenantId - Tenant ID
       * @returns {Promise<void>}
       */
      async initializeTenant(tenantId) {
        try {
          logger.info('Initializing WhatsApp for tenant', { tenantId });

          // Setup message handler
          const onMessageHandler = async (m) => {
            const sock = this.connection.getSocket(tenantId);
            const downloadMediaMessage = this.connection.getDownloadMediaMessage();
            await this.messageHandler.handleMessage(tenantId, m, sock, downloadMediaMessage);
          };

          // Initialize connection with message handler
          await this.connection.initialize(tenantId, {
            onMessage: onMessageHandler
          });

          logger.info('WhatsApp initialized successfully for tenant', { tenantId });
        } catch (error) {
          logger.error('Error initializing WhatsApp for tenant', {
            tenantId,
            error: error.message
          });
          throw error;
        }
      }

      /**
       * Send text message for tenant
       * @param {number} tenantId - Tenant ID
       * @param {string} phoneNumber - Phone number
       * @param {string} messageText - Message text
       * @returns {Promise<Object>} Result
       */
      async sendMessage(tenantId, phoneNumber, messageText) {
        try {
          logger.info('Sending message for tenant', { tenantId, phoneNumber });

          const result = await this.connection.sendMessage(tenantId, phoneNumber, messageText);

          if (result.success) {
            // Save outgoing message
            await this.messageHandler.saveOutgoingMessage(tenantId, phoneNumber, messageText, {
              messageType: 'text'
            });
          }

          return result;
        } catch (error) {
          logger.error('Error sending message for tenant', {
            tenantId,
            phoneNumber,
            error: error.message
          });
          return { success: false, error: error.message };
        }
      }

      /**
       * Send media message for tenant
       * @param {number} tenantId - Tenant ID
       * @param {string} phoneNumber - Phone number
       * @param {string} filePath - File path
       * @param {string} caption - Caption (optional)
       * @returns {Promise<Object>} Result
       */
      async sendMediaMessage(tenantId, phoneNumber, filePath, caption = '') {
        try {
          logger.info('Sending media message for tenant', { tenantId, phoneNumber, filePath });

          const sock = this.connection.getSocket(tenantId);

          if (!sock || !this.connection.isConnected(tenantId)) {
            return { success: false, error: 'WhatsApp not connected' };
          }

          // Upload media
          const media = await this.mediaHandler.uploadMedia(tenantId, filePath);

          if (!media) {
            return { success: false, error: 'Error uploading media' };
          }

          const jid = phoneNumber.includes('@') ? phoneNumber : `${phoneNumber}@s.whatsapp.net`;

          // Prepare message
          const message = {
            caption: caption || undefined
          };

          if (media.messageType === 'image') {
            message.image = media.buffer;
          } else if (media.messageType === 'video') {
            message.video = media.buffer;
          } else if (media.messageType === 'audio') {
            message.audio = media.buffer;
          } else {
            message.document = media.buffer;
            message.mimetype = media.mimeType;
          }

          // Send message
          await sock.sendMessage(jid, message);

          // Save outgoing message
          await this.messageHandler.saveOutgoingMessage(tenantId, phoneNumber, caption, {
            messageType: media.messageType,
            mediaMimetype: media.mimeType
          });

          logger.info('Media message sent for tenant', {
            tenantId,
            phoneNumber,
            mediaType: media.messageType
          });

          return { success: true };
        } catch (error) {
          logger.error('Error sending media message for tenant', {
            tenantId,
            phoneNumber,
            error: error.message
          });
          return { success: false, error: error.message };
        }
      }

      /**
       * Disconnect tenant
       * @param {number} tenantId - Tenant ID
       * @returns {Promise<boolean>} Success status
       */
      async disconnectTenant(tenantId) {
        try {
          logger.info('Disconnecting tenant', { tenantId });

          const result = await this.connection.disconnect(tenantId);

          if (result) {
            this.qrHandler.cleanup(tenantId);
          }

          return result;
        } catch (error) {
          logger.error('Error disconnecting tenant', {
            tenantId,
            error: error.message
          });
          return false;
        }
      }

      /**
       * Clear session for tenant
       * @param {number} tenantId - Tenant ID
       * @returns {Promise<boolean>} Success status
       */
      async clearSession(tenantId) {
        try {
          logger.info('Clearing session for tenant', { tenantId });

          // Disconnect first
          await this.disconnectTenant(tenantId);

          // Clear session files
          const result = this.stateManager.clearSession(tenantId);

          // Clear QR handler data
          this.qrHandler.cleanup(tenantId);

          return result;
        } catch (error) {
          logger.error('Error clearing session for tenant', {
            tenantId,
            error: error.message
          });
          return false;
        }
      }

      /**
       * Get connection status for tenant
       * @param {number} tenantId - Tenant ID
       * @returns {Object} Connection status
       */
      getConnectionStatus(tenantId) {
        const isConnected = this.connection.isConnected(tenantId);
        const hasSession = this.stateManager.hasSession(tenantId);
        const qrStats = this.qrHandler.getStats(tenantId);
        const sessionInfo = this.stateManager.getSessionInfo(tenantId);

        return {
          tenantId,
          isConnected,
          hasSession,
          qr: qrStats,
          session: sessionInfo
        };
      }

      /**
       * Get QR code for tenant
       * @param {number} tenantId - Tenant ID
       * @returns {string|null} QR code or null
       */
      getQRCode(tenantId) {
        return this.qrHandler.getCurrentQR(tenantId);
      }

      /**
       * Get socket for tenant
       * @param {number} tenantId - Tenant ID
       * @returns {Object|null} Socket or null
       */
      getSocket(tenantId) {
        return this.connection.getSocket(tenantId);
      }

      /**
       * Check if tenant is connected
       * @param {number} tenantId - Tenant ID
       * @returns {boolean} Connection status
       */
      isConnected(tenantId) {
        return this.connection.isConnected(tenantId);
      }

      /**
       * Get Web WhatsApp conversations for tenant
       * @param {number} tenantId - Tenant ID
       * @returns {Promise<Array>} List of conversations
       */
      async getWebConversations(tenantId) {
        try {
          logger.info('Fetching Web WhatsApp conversations for tenant', { tenantId });
          const chats = await this.connection.getChats(tenantId);
          // Transform chats into a format suitable for the frontend pipeline
          return chats.map(chat => ({
            id: chat.id,
            name: chat.name || chat.id.split('@')[0],
            phone: chat.id.split('@')[0],
            avatar: null, // Baileys chats don't directly provide avatar URLs
            lastMessage: chat.lastMessage?.message?.conversation || chat.lastMessage?.message?.extendedTextMessage?.text || '',
            timestamp: chat.lastMessage?.messageTimestamp * 1000 || 0,
            stageId: 'new', // Default stage for new web conversations
            tags: [],
            unreadCount: chat.unreadCount || 0,
            conversationId: chat.id,
            source: 'web'
          }));
        } catch (error) {
          logger.error('Error fetching Web WhatsApp conversations for tenant', {
            tenantId,
            error: error.message
          });
          return [];
        }
      }

      /**
       * Get service statistics
       * @returns {Object} Service statistics
       */
      getStats() {
        const sessionStats = this.stateManager.getStats();
        const activeTenants = this.qrHandler.getActiveTenants();

        return {
          sessions: sessionStats,
          activeTenants: activeTenants.length,
          tenants: activeTenants
        };
      }

      /**
       * Cleanup old data
       * @param {Object} options - Cleanup options
       * @returns {Object} Cleanup results
       */
      async cleanup(options = {}) {
        try {
          const results = {
            backups: 0,
            media: {}
          };

          // Clean old backups
          if (options.cleanBackups !== false) {
            results.backups = this.stateManager.cleanOldBackups(
              options.backupDaysToKeep || 7
            );
          }

          // Clean old media for each tenant
          if (options.cleanMedia !== false && options.tenantIds) {
            for (const tenantId of options.tenantIds) {
              const deleted = this.mediaHandler.cleanOldMedia(
                tenantId,
                options.mediaDaysToKeep || 30
              );
              results.media[tenantId] = deleted;
            }
          }

          logger.info('Cleanup completed', results);
          return results;
        } catch (error) {
          logger.error('Error during cleanup', { error: error.message });
          return { error: error.message };
        }
      }
    }

    module.exports = WhatsAppService;